For stand up arcades if you are lucky to pick up a Jamma wired machine on Ebay for say $400 (or less) (with a working screen) then you can easily buy a 1066 in 1 unit from HK direct. Last time I checked (a while ago) it was $180US for the unit and $50US to ship so for around $700 - $800 with little fuss you can do it yourself. If the screen doesnt work then you can pop in an LCD which will connect directly to the 1066 in 1 unit.

Things to watch out for. Make sure you buy a 2 player cabinet. Makes the games more fun to play and make sure the screen can be easily shifted to portrait (generally most can).

As for Cocktail cabs - I have an original with Galaga in it and I am reluctant to change this (unless I score a good Mooncresta PCB). This kits look pretty neat - but expensive.

Mark